[Jakub Wądołowski (jwadolowski)]

what

Add additional_metrics_enabled variable (default: false for backwards compatibility) that provisions an aws_cloudfront_monitoring_subscription resource when enabled.

why

Not all CloudFront metrics are enabled by default. Some (4xx/5xx error rates by HTTP status code, origin latency, and cache hit rate) are hidden behind a monitoring subscription. This adds a convenient switch to enable them when needed.

The realtime_metrics_subscription_status value could have been derived from var.additional_metrics_enabled, but that would introduce an unexpected resource change across all existing deployments.

references

A complementary PR to cloudposse/terraform-aws-cloudfront-cdn#162

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 95878411-1797-40e4-94cf-20babd5e6f45

📥 Commits

Reviewing files that changed from the base of the PR and between 58698d2 and b47722b.

⛔ Files ignored due to path filters (1)

• README.md is excluded by !README.md

📒 Files selected for processing (2)

• main.tf
• variables.tf

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📝 Walkthrough

Walkthrough

This PR adds optional CloudFront real-time metrics monitoring to a Terraform module. A new boolean input variable additional_metrics_enabled (default: false) allows users to opt in to real-time metrics. When enabled alongside the module itself, a new aws_cloudfront_monitoring_subscription resource attaches the monitoring subscription to the CloudFront distribution.

Changes

CloudFront real-time metrics monitoring

Layer / File(s)	Summary
CloudFront real-time metrics configuration and subscription variables.tf, main.tf	New boolean variable additional_metrics_enabled controls creation of aws_cloudfront_monitoring_subscription resource, which conditionally enables real-time metrics on the CloudFront distribution when both the module and feature flag are active.

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🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding a feature to enable additional CloudFront real-time metrics through a new variable and monitoring subscription resource.
Description check	✅ Passed	The description is clearly related to the changeset, explaining what was added (additional_metrics_enabled variable and aws_cloudfront_monitoring_subscription resource), why it was needed, and implementation rationale.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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These changes were released in v2.1.1.